Results 101 to 110 of about 36,673 (286)

Energetic, relativistic and ultra-relativistic electrons: Comparison of long-term VERB code simulations with Van Allen Probes measurements [PDF]

, 2015
In this study, we compare long-term simulations performed by the Versatile Electron Radiation Belt (VERB) code with observations from the Magnetic Electron Ion Spectrometer and Relativistic Electron-Proton Telescope instruments on the Van Allen Probes ...
Agapitov, Albert, Artemyev, Artemyev, Baker, Baker, Blake, Boyd, Brautigam, Carpenter, Cattell, Cully, Denton, Denton, Glauert, Green, Horne, Kennel, Kim, Kim, Kim, Kim, Li, Li, Mauk, Millan, O'Brien, O'Brien, Orlova, Reeves, Reeves, Reeves, Roederer, Rothwell, Russell, Schulz, Shprits, Shprits, Shprits, Shprits, Shprits, Shprits, Shprits, Shprits, Spence, Stratton, Su, Subbotin, Subbotin, Subbotin, Summers, Thorne, Thorne, Thorne, Tsyganenko, Tu, Tu, Tu, Turner, Ukhorskiy, Usanova, Vampola, Van Allen, Vernov   +63 more
core   +3 more sources

Observations of Relativistic Electron Enhancement and Butterfly Pitch Angle Distributions at Low L (<3)

Geophysical Research Letters
Electrons in Earth's outer radiation belt are highly dynamic, with fluxes changing by up to orders of magnitude. The penetration of electrons from the outer belt to the inner belt is one such change observed during geomagnetic storms and was previously ...
D. O'Brien, X. Li, L. Khoo, R. S. Selesnick, B. Hogan, H. Zhao, Y. Mei, V. Hoxie, D. N. Baker, S. G. Kanekal   +9 more
doaj   +1 more source

Lightning-induced neutrons as a possible source of charged particles in the Earth’s inner radiation belt

Earth and Planetary Physics
The Van Allen radiation belts are doughnut-shaped zones surrounding Earth, filled with highly energetic charged particles whose sources or loss mechanisms have been investigated for decades. As for the inner belt, cosmic ray albedo neutron decay (CRAND),
QuanQi Shi, ChenYao Han, Qiu-Gang Zong, Alexander Degeling, Shuo Wang, SuiYan Fu, PengZhi He   +6 more
doaj   +1 more source

An Empirical Model of the Equatorial Electron Pitch Angle Distributions in Earth's Outer Radiation Belt

Space Weather, 2022
In this study, we present an empirical model of the equatorial electron pitch angle distributions (PADs) in the outer radiation belt based on the full data set collected by the Magnetic Electron Ion Spectrometer (MagEIS) instrument onboard the Van Allen ...
Artem Smirnov, Yuri Y. Shprits, Hayley Allison, Nikita Aseev, Alexander Drozdov, Peter Kollmann, Dedong Wang, Anthony Saikin   +7 more
doaj   +1 more source

Hidden lineages in the African Sky Islands: A taxonomic reevaluation of Afrocarduus (Compositae)

Journal of Systematics and Evolution, EarlyView.
Species delimitation is crucial for biodiversity studies. Using Hyb‐Seq and phylogenomics, we reassessed Afrocarduus, endemic to Afromontane and Afroalpine regions, uncovering 16 evolutionary lineages (2.3 Mya). Morphological data support their distinctiveness, with acaulescence evolving independently twice. The traditionally broad A.
Lucía D. Moreyra, Juan Antonio Calleja, Cristina Roquet, Siri Birkeland, Carme Blanco‐Gavaldà, Mercè Galbany‐Casals, Abel Gizaw, Frederik Leliaert, Christian Brochmann, Alfonso Susanna   +9 more
wiley   +1 more source

Van Allen Probes show that the inner radiation zone contains no MeV electrons: ECT/MagEIS data [PDF]

, 2015
We present Van Allen Probe observations of electrons in the inner radiation zone. The measurements were made by the Energetic Particle, Composition, and Thermal Plasma/Magnetic Electron Ion Spectrometer (MagEIS) sensors that were designed to measure ...
D. N. Baker, G. D. Reeves, H. E. Spence, Hess W. N., J. B. Blake, J. F. Fennell, J. H. Clemmons, S. G. Claudepierre, T. P. O'Brien   +8 more
core   +3 more sources

Empirical Patterns of High-Energy Particle Dynamics of the Van Allen Radiation Belts

Advances in Aerospace Science and Technology, 2020
The Van Allen radiation belts consist of megaelectron volt particles trapped in the Earth’s magnetic field mainly with protons at low altitudes and electrons at high altitudes.
Yuhan Liu
semanticscholar   +1 more source

Integrative phylogenomics and morphology reveal the evolution and biogeography of Encephalartos (Zamiaceae)

Journal of Systematics and Evolution, EarlyView.
We aimed to conduct phylogenetic analyses of Encephalartos, a cycad genus endemic to Africa, using 3545 single‐copy nuclear genes extracted from transcriptome data, covering 64/65 of the recognized species, along with inference of divergence times using two secondary calibration points.
Sadaf Habib, Anders Lindstrom, James A.R. Clugston, Yiqing Gong, Shanshan Dong, Yunhua Wang, Dennis Stevenson, Chen Feng, Shouzhou Zhang   +8 more
wiley   +1 more source

Forecast of the Energetic Electron Environment of the Radiation Belts

Space Weather, 2022
Different modeling methodologies possess different strengths and weakness. For instance, data based models may provide superior accuracy but have a limited spatial coverage while physics based models may provide lower accuracy but provide greater spatial
Simon N. Walker, Richard J. Boynton, Yuri Y. Shprits, Michael A. Balikhin, Alexander Y. Drozdov   +4 more
doaj   +1 more source

Rapid terrestrial weathering of the CI1 carbonaceous chondrite find Oued Chebeika 002

Meteoritics &Planetary Science, EarlyView.
Abstract Alteration of historic CI1 meteorite falls during their curation demonstrates the susceptibility of smectite‐rich carbonaceous chondrites to terrestrial exposure. The discovery of Oued Chebeika 002 in Morocco in June 2024 presents a unique opportunity to document the earliest stages of weathering of a CI1 find.
Martin R. Lee, Jasper Glazer
wiley   +1 more source